1 /* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char rcsid[] _U_ = 36 "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.128 2008-12-23 20:13:29 guy Exp $ (LBL)"; 37 #endif 38 39 #ifdef HAVE_CONFIG_H 40 #include "config.h" 41 #endif 42 43 #ifdef WIN32 44 #include <pcap-stdinc.h> 45 #else /* WIN32 */ 46 #if HAVE_INTTYPES_H 47 #include <inttypes.h> 48 #elif HAVE_STDINT_H 49 #include <stdint.h> 50 #endif 51 #ifdef HAVE_SYS_BITYPES_H 52 #include <sys/bitypes.h> 53 #endif 54 #include <sys/types.h> 55 #include <sys/mman.h> 56 #endif /* WIN32 */ 57 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #if !defined(_MSC_VER) && !defined(__BORLANDC__) 62 #include <unistd.h> 63 #endif 64 #include <fcntl.h> 65 #include <errno.h> 66 67 #ifdef HAVE_OS_PROTO_H 68 #include "os-proto.h" 69 #endif 70 71 #ifdef MSDOS 72 #include "pcap-dos.h" 73 #endif 74 75 #include "pcap-int.h" 76 77 #ifdef HAVE_DAG_API 78 #include <dagnew.h> 79 #include <dagapi.h> 80 #endif 81 82 int 83 pcap_not_initialized(pcap_t *pcap) 84 { 85 /* this means 'not initialized' */ 86 return PCAP_ERROR_NOT_ACTIVATED; 87 } 88 89 /* 90 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, 91 * a PCAP_ERROR value on an error. 92 */ 93 int 94 pcap_can_set_rfmon(pcap_t *p) 95 { 96 return (p->can_set_rfmon_op(p)); 97 } 98 99 /* 100 * For systems where rfmon mode is never supported. 101 */ 102 static int 103 pcap_cant_set_rfmon(pcap_t *p _U_) 104 { 105 return (0); 106 } 107 108 /* 109 * Default one-shot callback; overridden for capture types where the 110 * packet data cannot be guaranteed to be available after the callback 111 * returns, so that a copy must be made. 112 */ 113 static void 114 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt) 115 { 116 struct oneshot_userdata *sp = (struct oneshot_userdata *)user; 117 118 *sp->hdr = *h; 119 *sp->pkt = pkt; 120 } 121 122 const u_char * 123 pcap_next(pcap_t *p, struct pcap_pkthdr *h) 124 { 125 struct oneshot_userdata s; 126 const u_char *pkt; 127 128 s.hdr = h; 129 s.pkt = &pkt; 130 s.pd = p; 131 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0) 132 return (0); 133 return (pkt); 134 } 135 136 int 137 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, 138 const u_char **pkt_data) 139 { 140 struct oneshot_userdata s; 141 142 s.hdr = &p->pcap_header; 143 s.pkt = pkt_data; 144 s.pd = p; 145 146 /* Saves a pointer to the packet headers */ 147 *pkt_header= &p->pcap_header; 148 149 if (p->sf.rfile != NULL) { 150 int status; 151 152 /* We are on an offline capture */ 153 status = pcap_offline_read(p, 1, pcap_oneshot, (u_char *)&s); 154 155 /* 156 * Return codes for pcap_offline_read() are: 157 * - 0: EOF 158 * - -1: error 159 * - >1: OK 160 * The first one ('0') conflicts with the return code of 161 * 0 from pcap_read() meaning "no packets arrived before 162 * the timeout expired", so we map it to -2 so you can 163 * distinguish between an EOF from a savefile and a 164 * "no packets arrived before the timeout expired, try 165 * again" from a live capture. 166 */ 167 if (status == 0) 168 return (-2); 169 else 170 return (status); 171 } 172 173 /* 174 * Return codes for pcap_read() are: 175 * - 0: timeout 176 * - -1: error 177 * - -2: loop was broken out of with pcap_breakloop() 178 * - >1: OK 179 * The first one ('0') conflicts with the return code of 0 from 180 * pcap_offline_read() meaning "end of file". 181 */ 182 return (p->read_op(p, 1, pcap_oneshot, (u_char *)&s)); 183 } 184 185 static void 186 initialize_ops(pcap_t *p) 187 { 188 /* 189 * Set operation pointers for operations that only work on 190 * an activated pcap_t to point to a routine that returns 191 * a "this isn't activated" error. 192 */ 193 p->read_op = (read_op_t)pcap_not_initialized; 194 p->inject_op = (inject_op_t)pcap_not_initialized; 195 p->setfilter_op = (setfilter_op_t)pcap_not_initialized; 196 p->setdirection_op = (setdirection_op_t)pcap_not_initialized; 197 p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized; 198 p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized; 199 p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized; 200 p->stats_op = (stats_op_t)pcap_not_initialized; 201 #ifdef WIN32 202 p->setbuff_op = (setbuff_op_t)pcap_not_initialized; 203 p->setmode_op = (setmode_op_t)pcap_not_initialized; 204 p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized; 205 #endif 206 207 /* 208 * Default cleanup operation - implementations can override 209 * this, but should call pcap_cleanup_live_common() after 210 * doing their own additional cleanup. 211 */ 212 p->cleanup_op = pcap_cleanup_live_common; 213 214 /* 215 * In most cases, the standard one-short callback can 216 * be used for pcap_next()/pcap_next_ex(). 217 */ 218 p->oneshot_callback = pcap_oneshot; 219 } 220 221 pcap_t * 222 pcap_create_common(const char *source, char *ebuf) 223 { 224 pcap_t *p; 225 226 p = malloc(sizeof(*p)); 227 if (p == NULL) { 228 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 229 pcap_strerror(errno)); 230 return (NULL); 231 } 232 memset(p, 0, sizeof(*p)); 233 #ifndef WIN32 234 p->fd = -1; /* not opened yet */ 235 p->selectable_fd = -1; 236 p->send_fd = -1; 237 #endif 238 239 p->opt.source = strdup(source); 240 if (p->opt.source == NULL) { 241 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", 242 pcap_strerror(errno)); 243 free(p); 244 return (NULL); 245 } 246 247 /* 248 * Default to "can't set rfmon mode"; if it's supported by 249 * a platform, the create routine that called us can set 250 * the op to its routine to check whether a particular 251 * device supports it. 252 */ 253 p->can_set_rfmon_op = pcap_cant_set_rfmon; 254 255 initialize_ops(p); 256 257 /* put in some defaults*/ 258 pcap_set_timeout(p, 0); 259 pcap_set_snaplen(p, 65535); /* max packet size */ 260 p->opt.promisc = 0; 261 p->opt.buffer_size = 0; 262 return (p); 263 } 264 265 int 266 pcap_check_activated(pcap_t *p) 267 { 268 if (p->activated) { 269 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " 270 " operation on activated capture"); 271 return -1; 272 } 273 return 0; 274 } 275 276 int 277 pcap_set_snaplen(pcap_t *p, int snaplen) 278 { 279 if (pcap_check_activated(p)) 280 return PCAP_ERROR_ACTIVATED; 281 p->snapshot = snaplen; 282 return 0; 283 } 284 285 int 286 pcap_set_promisc(pcap_t *p, int promisc) 287 { 288 if (pcap_check_activated(p)) 289 return PCAP_ERROR_ACTIVATED; 290 p->opt.promisc = promisc; 291 return 0; 292 } 293 294 int 295 pcap_set_rfmon(pcap_t *p, int rfmon) 296 { 297 if (pcap_check_activated(p)) 298 return PCAP_ERROR_ACTIVATED; 299 p->opt.rfmon = rfmon; 300 return 0; 301 } 302 303 int 304 pcap_set_timeout(pcap_t *p, int timeout_ms) 305 { 306 if (pcap_check_activated(p)) 307 return PCAP_ERROR_ACTIVATED; 308 p->md.timeout = timeout_ms; 309 return 0; 310 } 311 312 int 313 pcap_set_buffer_size(pcap_t *p, int buffer_size) 314 { 315 if (pcap_check_activated(p)) 316 return PCAP_ERROR_ACTIVATED; 317 p->opt.buffer_size = buffer_size; 318 return 0; 319 } 320 321 int 322 pcap_activate(pcap_t *p) 323 { 324 int status; 325 326 status = p->activate_op(p); 327 if (status >= 0) 328 p->activated = 1; 329 else { 330 if (p->errbuf[0] == '\0') { 331 /* 332 * No error message supplied by the activate routine; 333 * for the benefit of programs that don't specially 334 * handle errors other than PCAP_ERROR, return the 335 * error message corresponding to the status. 336 */ 337 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s", 338 pcap_statustostr(status)); 339 } 340 341 /* 342 * Undo any operation pointer setting, etc. done by 343 * the activate operation. 344 */ 345 initialize_ops(p); 346 } 347 return (status); 348 } 349 350 pcap_t * 351 pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf) 352 { 353 pcap_t *p; 354 int status; 355 356 p = pcap_create(source, errbuf); 357 if (p == NULL) 358 return (NULL); 359 status = pcap_set_snaplen(p, snaplen); 360 if (status < 0) 361 goto fail; 362 status = pcap_set_promisc(p, promisc); 363 if (status < 0) 364 goto fail; 365 status = pcap_set_timeout(p, to_ms); 366 if (status < 0) 367 goto fail; 368 /* 369 * Mark this as opened with pcap_open_live(), so that, for 370 * example, we show the full list of DLT_ values, rather 371 * than just the ones that are compatible with capturing 372 * when not in monitor mode. That allows existing applications 373 * to work the way they used to work, but allows new applications 374 * that know about the new open API to, for example, find out the 375 * DLT_ values that they can select without changing whether 376 * the adapter is in monitor mode or not. 377 */ 378 p->oldstyle = 1; 379 status = pcap_activate(p); 380 if (status < 0) 381 goto fail; 382 return (p); 383 fail: 384 if (status == PCAP_ERROR) 385 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source, 386 p->errbuf); 387 else if (status == PCAP_ERROR_NO_SUCH_DEVICE || 388 status == PCAP_ERROR_PERM_DENIED) 389 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", source, 390 pcap_statustostr(status), p->errbuf); 391 else 392 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source, 393 pcap_statustostr(status)); 394 pcap_close(p); 395 return (NULL); 396 } 397 398 int 399 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 400 { 401 return p->read_op(p, cnt, callback, user); 402 } 403 404 /* 405 * XXX - is this necessary? 406 */ 407 int 408 pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 409 { 410 411 return p->read_op(p, cnt, callback, user); 412 } 413 414 int 415 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 416 { 417 register int n; 418 419 for (;;) { 420 if (p->sf.rfile != NULL) { 421 /* 422 * 0 means EOF, so don't loop if we get 0. 423 */ 424 n = pcap_offline_read(p, cnt, callback, user); 425 } else { 426 /* 427 * XXX keep reading until we get something 428 * (or an error occurs) 429 */ 430 do { 431 n = p->read_op(p, cnt, callback, user); 432 } while (n == 0); 433 } 434 if (n <= 0) 435 return (n); 436 if (cnt > 0) { 437 cnt -= n; 438 if (cnt <= 0) 439 return (0); 440 } 441 } 442 } 443 444 /* 445 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. 446 */ 447 void 448 pcap_breakloop(pcap_t *p) 449 { 450 p->break_loop = 1; 451 } 452 453 int 454 pcap_datalink(pcap_t *p) 455 { 456 return (p->linktype); 457 } 458 459 int 460 pcap_datalink_ext(pcap_t *p) 461 { 462 return (p->linktype_ext); 463 } 464 465 int 466 pcap_list_datalinks(pcap_t *p, int **dlt_buffer) 467 { 468 if (p->dlt_count == 0) { 469 /* 470 * We couldn't fetch the list of DLTs, which means 471 * this platform doesn't support changing the 472 * DLT for an interface. Return a list of DLTs 473 * containing only the DLT this device supports. 474 */ 475 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); 476 if (*dlt_buffer == NULL) { 477 (void)snprintf(p->errbuf, sizeof(p->errbuf), 478 "malloc: %s", pcap_strerror(errno)); 479 return (-1); 480 } 481 **dlt_buffer = p->linktype; 482 return (1); 483 } else { 484 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); 485 if (*dlt_buffer == NULL) { 486 (void)snprintf(p->errbuf, sizeof(p->errbuf), 487 "malloc: %s", pcap_strerror(errno)); 488 return (-1); 489 } 490 (void)memcpy(*dlt_buffer, p->dlt_list, 491 sizeof(**dlt_buffer) * p->dlt_count); 492 return (p->dlt_count); 493 } 494 } 495 496 /* 497 * In Windows, you might have a library built with one version of the 498 * C runtime library and an application built with another version of 499 * the C runtime library, which means that the library might use one 500 * version of malloc() and free() and the application might use another 501 * version of malloc() and free(). If so, that means something 502 * allocated by the library cannot be freed by the application, so we 503 * need to have a pcap_free_datalinks() routine to free up the list 504 * allocated by pcap_list_datalinks(), even though it's just a wrapper 505 * around free(). 506 */ 507 void 508 pcap_free_datalinks(int *dlt_list) 509 { 510 free(dlt_list); 511 } 512 513 int 514 pcap_set_datalink(pcap_t *p, int dlt) 515 { 516 int i; 517 const char *dlt_name; 518 519 if (p->dlt_count == 0 || p->set_datalink_op == NULL) { 520 /* 521 * We couldn't fetch the list of DLTs, or we don't 522 * have a "set datalink" operation, which means 523 * this platform doesn't support changing the 524 * DLT for an interface. Check whether the new 525 * DLT is the one this interface supports. 526 */ 527 if (p->linktype != dlt) 528 goto unsupported; 529 530 /* 531 * It is, so there's nothing we need to do here. 532 */ 533 return (0); 534 } 535 for (i = 0; i < p->dlt_count; i++) 536 if (p->dlt_list[i] == dlt) 537 break; 538 if (i >= p->dlt_count) 539 goto unsupported; 540 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && 541 dlt == DLT_DOCSIS) { 542 /* 543 * This is presumably an Ethernet device, as the first 544 * link-layer type it offers is DLT_EN10MB, and the only 545 * other type it offers is DLT_DOCSIS. That means that 546 * we can't tell the driver to supply DOCSIS link-layer 547 * headers - we're just pretending that's what we're 548 * getting, as, presumably, we're capturing on a dedicated 549 * link to a Cisco Cable Modem Termination System, and 550 * it's putting raw DOCSIS frames on the wire inside low-level 551 * Ethernet framing. 552 */ 553 p->linktype = dlt; 554 return (0); 555 } 556 if (p->set_datalink_op(p, dlt) == -1) 557 return (-1); 558 p->linktype = dlt; 559 return (0); 560 561 unsupported: 562 dlt_name = pcap_datalink_val_to_name(dlt); 563 if (dlt_name != NULL) { 564 (void) snprintf(p->errbuf, sizeof(p->errbuf), 565 "%s is not one of the DLTs supported by this device", 566 dlt_name); 567 } else { 568 (void) snprintf(p->errbuf, sizeof(p->errbuf), 569 "DLT %d is not one of the DLTs supported by this device", 570 dlt); 571 } 572 return (-1); 573 } 574 575 struct dlt_choice { 576 const char *name; 577 const char *description; 578 int dlt; 579 }; 580 581 #define DLT_CHOICE(code, description) { #code, description, code } 582 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } 583 584 static struct dlt_choice dlt_choices[] = { 585 DLT_CHOICE(DLT_NULL, "BSD loopback"), 586 DLT_CHOICE(DLT_EN10MB, "Ethernet"), 587 DLT_CHOICE(DLT_IEEE802, "Token ring"), 588 DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"), 589 DLT_CHOICE(DLT_SLIP, "SLIP"), 590 DLT_CHOICE(DLT_PPP, "PPP"), 591 DLT_CHOICE(DLT_FDDI, "FDDI"), 592 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), 593 DLT_CHOICE(DLT_RAW, "Raw IP"), 594 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"), 595 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"), 596 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"), 597 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"), 598 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"), 599 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"), 600 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"), 601 DLT_CHOICE(DLT_IEEE802_11, "802.11"), 602 DLT_CHOICE(DLT_FRELAY, "Frame Relay"), 603 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"), 604 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"), 605 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"), 606 DLT_CHOICE(DLT_LTALK, "Localtalk"), 607 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"), 608 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"), 609 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), 610 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"), 611 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"), 612 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"), 613 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"), 614 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), 615 DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"), 616 DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"), 617 DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), 618 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"), 619 DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"), 620 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"), 621 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), 622 DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), 623 DLT_CHOICE(DLT_MTP2, "SS7 MTP2"), 624 DLT_CHOICE(DLT_MTP3, "SS7 MTP3"), 625 DLT_CHOICE(DLT_SCCP, "SS7 SCCP"), 626 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"), 627 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"), 628 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), 629 DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), 630 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"), 631 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"), 632 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), 633 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"), 634 DLT_CHOICE(DLT_GPF_T, "GPF-T"), 635 DLT_CHOICE(DLT_GPF_F, "GPF-F"), 636 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"), 637 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"), 638 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"), 639 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"), 640 DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"), 641 DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"), 642 DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"), 643 DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"), 644 DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"), 645 DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"), 646 DLT_CHOICE(DLT_A429, "Arinc 429"), 647 DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"), 648 DLT_CHOICE(DLT_USB, "USB"), 649 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), 650 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), 651 DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"), 652 DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"), 653 DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), 654 DLT_CHOICE(DLT_PPI, "Per-Packet Information"), 655 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), 656 DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"), 657 DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4"), 658 DLT_CHOICE(DLT_SITA, "SITA pseudo-header"), 659 DLT_CHOICE(DLT_ERF, "Endace ERF header"), 660 DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"), 661 DLT_CHOICE(DLT_IPMB, "IPMB"), 662 DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"), 663 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), 664 DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"), 665 DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), 666 DLT_CHOICE(DLT_MPLS, "MPLS with label as link-layer header"), 667 DLT_CHOICE(DLT_USB_LINUX_MMAPPED, "USB with padded Linux header"), 668 DLT_CHOICE(DLT_DECT, "DECT"), 669 DLT_CHOICE(DLT_AOS, "AOS Space Data Link protocol"), 670 DLT_CHOICE(DLT_WIHART, "Wireless HART"), 671 DLT_CHOICE(DLT_FC_2, "Fibre Channel FC-2"), 672 DLT_CHOICE(DLT_FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"), 673 DLT_CHOICE(DLT_IPNET, "Solaris ipnet"), 674 DLT_CHOICE(DLT_CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"), 675 DLT_CHOICE(DLT_IPV4, "Raw IPv4"), 676 DLT_CHOICE(DLT_IPV6, "Raw IPv6"), 677 DLT_CHOICE_SENTINEL 678 }; 679 680 /* 681 * This array is designed for mapping upper and lower case letter 682 * together for a case independent comparison. The mappings are 683 * based upon ascii character sequences. 684 */ 685 static const u_char charmap[] = { 686 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', 687 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', 688 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', 689 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', 690 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', 691 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', 692 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', 693 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', 694 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', 695 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', 696 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', 697 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', 698 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', 699 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', 700 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', 701 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', 702 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', 703 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 704 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 705 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 706 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 707 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 708 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', 709 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', 710 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', 711 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', 712 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', 713 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', 714 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', 715 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', 716 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', 717 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', 718 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', 719 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', 720 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', 721 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', 722 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', 723 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', 724 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', 725 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', 726 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', 727 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', 728 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', 729 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', 730 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', 731 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', 732 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', 733 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', 734 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', 735 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 736 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 737 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 738 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 739 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 740 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', 741 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', 742 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', 743 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', 744 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', 745 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', 746 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', 747 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', 748 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', 749 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', 750 }; 751 752 int 753 pcap_strcasecmp(const char *s1, const char *s2) 754 { 755 register const u_char *cm = charmap, 756 *us1 = (const u_char *)s1, 757 *us2 = (const u_char *)s2; 758 759 while (cm[*us1] == cm[*us2++]) 760 if (*us1++ == '\0') 761 return(0); 762 return (cm[*us1] - cm[*--us2]); 763 } 764 765 int 766 pcap_datalink_name_to_val(const char *name) 767 { 768 int i; 769 770 for (i = 0; dlt_choices[i].name != NULL; i++) { 771 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1, 772 name) == 0) 773 return (dlt_choices[i].dlt); 774 } 775 return (-1); 776 } 777 778 const char * 779 pcap_datalink_val_to_name(int dlt) 780 { 781 int i; 782 783 for (i = 0; dlt_choices[i].name != NULL; i++) { 784 if (dlt_choices[i].dlt == dlt) 785 return (dlt_choices[i].name + sizeof("DLT_") - 1); 786 } 787 return (NULL); 788 } 789 790 const char * 791 pcap_datalink_val_to_description(int dlt) 792 { 793 int i; 794 795 for (i = 0; dlt_choices[i].name != NULL; i++) { 796 if (dlt_choices[i].dlt == dlt) 797 return (dlt_choices[i].description); 798 } 799 return (NULL); 800 } 801 802 int 803 pcap_snapshot(pcap_t *p) 804 { 805 return (p->snapshot); 806 } 807 808 int 809 pcap_is_swapped(pcap_t *p) 810 { 811 return (p->sf.swapped); 812 } 813 814 int 815 pcap_major_version(pcap_t *p) 816 { 817 return (p->sf.version_major); 818 } 819 820 int 821 pcap_minor_version(pcap_t *p) 822 { 823 return (p->sf.version_minor); 824 } 825 826 FILE * 827 pcap_file(pcap_t *p) 828 { 829 return (p->sf.rfile); 830 } 831 832 int 833 pcap_fileno(pcap_t *p) 834 { 835 #ifndef WIN32 836 return (p->fd); 837 #else 838 if (p->adapter != NULL) 839 return ((int)(DWORD)p->adapter->hFile); 840 else 841 return (-1); 842 #endif 843 } 844 845 #if !defined(WIN32) && !defined(MSDOS) 846 int 847 pcap_get_selectable_fd(pcap_t *p) 848 { 849 return (p->selectable_fd); 850 } 851 #endif 852 853 void 854 pcap_perror(pcap_t *p, char *prefix) 855 { 856 fprintf(stderr, "%s: %s\n", prefix, p->errbuf); 857 } 858 859 char * 860 pcap_geterr(pcap_t *p) 861 { 862 return (p->errbuf); 863 } 864 865 int 866 pcap_getnonblock(pcap_t *p, char *errbuf) 867 { 868 return p->getnonblock_op(p, errbuf); 869 } 870 871 /* 872 * Get the current non-blocking mode setting, under the assumption that 873 * it's just the standard POSIX non-blocking flag. 874 * 875 * We don't look at "p->nonblock", in case somebody tweaked the FD 876 * directly. 877 */ 878 #if !defined(WIN32) && !defined(MSDOS) 879 int 880 pcap_getnonblock_fd(pcap_t *p, char *errbuf) 881 { 882 int fdflags; 883 884 fdflags = fcntl(p->fd, F_GETFL, 0); 885 if (fdflags == -1) { 886 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 887 pcap_strerror(errno)); 888 return (-1); 889 } 890 if (fdflags & O_NONBLOCK) 891 return (1); 892 else 893 return (0); 894 } 895 #endif 896 897 int 898 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) 899 { 900 return p->setnonblock_op(p, nonblock, errbuf); 901 } 902 903 #if !defined(WIN32) && !defined(MSDOS) 904 /* 905 * Set non-blocking mode, under the assumption that it's just the 906 * standard POSIX non-blocking flag. (This can be called by the 907 * per-platform non-blocking-mode routine if that routine also 908 * needs to do some additional work.) 909 */ 910 int 911 pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf) 912 { 913 int fdflags; 914 915 fdflags = fcntl(p->fd, F_GETFL, 0); 916 if (fdflags == -1) { 917 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s", 918 pcap_strerror(errno)); 919 return (-1); 920 } 921 if (nonblock) 922 fdflags |= O_NONBLOCK; 923 else 924 fdflags &= ~O_NONBLOCK; 925 if (fcntl(p->fd, F_SETFL, fdflags) == -1) { 926 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s", 927 pcap_strerror(errno)); 928 return (-1); 929 } 930 return (0); 931 } 932 #endif 933 934 #ifdef WIN32 935 /* 936 * Generate a string for the last Win32-specific error (i.e. an error generated when 937 * calling a Win32 API). 938 * For errors occurred during standard C calls, we still use pcap_strerror() 939 */ 940 char * 941 pcap_win32strerror(void) 942 { 943 DWORD error; 944 static char errbuf[PCAP_ERRBUF_SIZE+1]; 945 int errlen; 946 char *p; 947 948 error = GetLastError(); 949 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf, 950 PCAP_ERRBUF_SIZE, NULL); 951 952 /* 953 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the 954 * message. Get rid of it. 955 */ 956 errlen = strlen(errbuf); 957 if (errlen >= 2) { 958 errbuf[errlen - 1] = '\0'; 959 errbuf[errlen - 2] = '\0'; 960 } 961 p = strchr(errbuf, '\0'); 962 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error); 963 return (errbuf); 964 } 965 #endif 966 967 /* 968 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. 969 */ 970 const char * 971 pcap_statustostr(int errnum) 972 { 973 static char ebuf[15+10+1]; 974 975 switch (errnum) { 976 977 case PCAP_WARNING: 978 return("Generic warning"); 979 980 case PCAP_WARNING_PROMISC_NOTSUP: 981 return ("That device doesn't support promiscuous mode"); 982 983 case PCAP_ERROR: 984 return("Generic error"); 985 986 case PCAP_ERROR_BREAK: 987 return("Loop terminated by pcap_breakloop"); 988 989 case PCAP_ERROR_NOT_ACTIVATED: 990 return("The pcap_t has not been activated"); 991 992 case PCAP_ERROR_ACTIVATED: 993 return ("The setting can't be changed after the pcap_t is activated"); 994 995 case PCAP_ERROR_NO_SUCH_DEVICE: 996 return ("No such device exists"); 997 998 case PCAP_ERROR_RFMON_NOTSUP: 999 return ("That device doesn't support monitor mode"); 1000 1001 case PCAP_ERROR_NOT_RFMON: 1002 return ("That operation is supported only in monitor mode"); 1003 1004 case PCAP_ERROR_PERM_DENIED: 1005 return ("You don't have permission to capture on that device"); 1006 1007 case PCAP_ERROR_IFACE_NOT_UP: 1008 return ("That device is not up"); 1009 } 1010 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 1011 return(ebuf); 1012 } 1013 1014 /* 1015 * Not all systems have strerror(). 1016 */ 1017 const char * 1018 pcap_strerror(int errnum) 1019 { 1020 #ifdef HAVE_STRERROR 1021 return (strerror(errnum)); 1022 #else 1023 extern int sys_nerr; 1024 extern const char *const sys_errlist[]; 1025 static char ebuf[15+10+1]; 1026 1027 if ((unsigned int)errnum < sys_nerr) 1028 return ((char *)sys_errlist[errnum]); 1029 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); 1030 return(ebuf); 1031 #endif 1032 } 1033 1034 int 1035 pcap_setfilter(pcap_t *p, struct bpf_program *fp) 1036 { 1037 return p->setfilter_op(p, fp); 1038 } 1039 1040 /* 1041 * Set direction flag, which controls whether we accept only incoming 1042 * packets, only outgoing packets, or both. 1043 * Note that, depending on the platform, some or all direction arguments 1044 * might not be supported. 1045 */ 1046 int 1047 pcap_setdirection(pcap_t *p, pcap_direction_t d) 1048 { 1049 if (p->setdirection_op == NULL) { 1050 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1051 "Setting direction is not implemented on this platform"); 1052 return -1; 1053 } else 1054 return p->setdirection_op(p, d); 1055 } 1056 1057 int 1058 pcap_stats(pcap_t *p, struct pcap_stat *ps) 1059 { 1060 return p->stats_op(p, ps); 1061 } 1062 1063 static int 1064 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) 1065 { 1066 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1067 "Statistics aren't available from a pcap_open_dead pcap_t"); 1068 return (-1); 1069 } 1070 1071 #ifdef WIN32 1072 int 1073 pcap_setbuff(pcap_t *p, int dim) 1074 { 1075 return p->setbuff_op(p, dim); 1076 } 1077 1078 static int 1079 pcap_setbuff_dead(pcap_t *p, int dim) 1080 { 1081 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1082 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); 1083 return (-1); 1084 } 1085 1086 int 1087 pcap_setmode(pcap_t *p, int mode) 1088 { 1089 return p->setmode_op(p, mode); 1090 } 1091 1092 static int 1093 pcap_setmode_dead(pcap_t *p, int mode) 1094 { 1095 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1096 "impossible to set mode on a pcap_open_dead pcap_t"); 1097 return (-1); 1098 } 1099 1100 int 1101 pcap_setmintocopy(pcap_t *p, int size) 1102 { 1103 return p->setmintocopy_op(p, size); 1104 } 1105 1106 static int 1107 pcap_setmintocopy_dead(pcap_t *p, int size) 1108 { 1109 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1110 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); 1111 return (-1); 1112 } 1113 #endif 1114 1115 /* 1116 * On some platforms, we need to clean up promiscuous or monitor mode 1117 * when we close a device - and we want that to happen even if the 1118 * application just exits without explicitl closing devices. 1119 * On those platforms, we need to register a "close all the pcaps" 1120 * routine to be called when we exit, and need to maintain a list of 1121 * pcaps that need to be closed to clean up modes. 1122 * 1123 * XXX - not thread-safe. 1124 */ 1125 1126 /* 1127 * List of pcaps on which we've done something that needs to be 1128 * cleaned up. 1129 * If there are any such pcaps, we arrange to call "pcap_close_all()" 1130 * when we exit, and have it close all of them. 1131 */ 1132 static struct pcap *pcaps_to_close; 1133 1134 /* 1135 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to 1136 * be called on exit. 1137 */ 1138 static int did_atexit; 1139 1140 static void 1141 pcap_close_all(void) 1142 { 1143 struct pcap *handle; 1144 1145 while ((handle = pcaps_to_close) != NULL) 1146 pcap_close(handle); 1147 } 1148 1149 int 1150 pcap_do_addexit(pcap_t *p) 1151 { 1152 /* 1153 * If we haven't already done so, arrange to have 1154 * "pcap_close_all()" called when we exit. 1155 */ 1156 if (!did_atexit) { 1157 if (atexit(pcap_close_all) == -1) { 1158 /* 1159 * "atexit()" failed; let our caller know. 1160 */ 1161 strncpy(p->errbuf, "atexit failed", 1162 PCAP_ERRBUF_SIZE); 1163 return (0); 1164 } 1165 did_atexit = 1; 1166 } 1167 return (1); 1168 } 1169 1170 void 1171 pcap_add_to_pcaps_to_close(pcap_t *p) 1172 { 1173 p->md.next = pcaps_to_close; 1174 pcaps_to_close = p; 1175 } 1176 1177 void 1178 pcap_remove_from_pcaps_to_close(pcap_t *p) 1179 { 1180 pcap_t *pc, *prevpc; 1181 1182 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; 1183 prevpc = pc, pc = pc->md.next) { 1184 if (pc == p) { 1185 /* 1186 * Found it. Remove it from the list. 1187 */ 1188 if (prevpc == NULL) { 1189 /* 1190 * It was at the head of the list. 1191 */ 1192 pcaps_to_close = pc->md.next; 1193 } else { 1194 /* 1195 * It was in the middle of the list. 1196 */ 1197 prevpc->md.next = pc->md.next; 1198 } 1199 break; 1200 } 1201 } 1202 } 1203 1204 void 1205 pcap_cleanup_live_common(pcap_t *p) 1206 { 1207 if (p->buffer != NULL) { 1208 free(p->buffer); 1209 p->buffer = NULL; 1210 } 1211 if (p->dlt_list != NULL) { 1212 free(p->dlt_list); 1213 p->dlt_list = NULL; 1214 p->dlt_count = 0; 1215 } 1216 pcap_freecode(&p->fcode); 1217 #if !defined(WIN32) && !defined(MSDOS) 1218 if (p->fd >= 0) { 1219 close(p->fd); 1220 p->fd = -1; 1221 } 1222 p->selectable_fd = -1; 1223 p->send_fd = -1; 1224 #endif 1225 } 1226 1227 static void 1228 pcap_cleanup_dead(pcap_t *p _U_) 1229 { 1230 /* Nothing to do. */ 1231 } 1232 1233 pcap_t * 1234 pcap_open_dead(int linktype, int snaplen) 1235 { 1236 pcap_t *p; 1237 1238 p = malloc(sizeof(*p)); 1239 if (p == NULL) 1240 return NULL; 1241 memset (p, 0, sizeof(*p)); 1242 p->snapshot = snaplen; 1243 p->linktype = linktype; 1244 p->stats_op = pcap_stats_dead; 1245 #ifdef WIN32 1246 p->setbuff_op = pcap_setbuff_dead; 1247 p->setmode_op = pcap_setmode_dead; 1248 p->setmintocopy_op = pcap_setmintocopy_dead; 1249 #endif 1250 p->cleanup_op = pcap_cleanup_dead; 1251 p->activated = 1; 1252 return p; 1253 } 1254 1255 /* 1256 * API compatible with WinPcap's "send a packet" routine - returns -1 1257 * on error, 0 otherwise. 1258 * 1259 * XXX - what if we get a short write? 1260 */ 1261 int 1262 pcap_sendpacket(pcap_t *p, const u_char *buf, int size) 1263 { 1264 if (p->inject_op(p, buf, size) == -1) 1265 return (-1); 1266 return (0); 1267 } 1268 1269 /* 1270 * API compatible with OpenBSD's "send a packet" routine - returns -1 on 1271 * error, number of bytes written otherwise. 1272 */ 1273 int 1274 pcap_inject(pcap_t *p, const void *buf, size_t size) 1275 { 1276 return (p->inject_op(p, buf, size)); 1277 } 1278 1279 void 1280 pcap_close(pcap_t *p) 1281 { 1282 if (p->opt.source != NULL) 1283 free(p->opt.source); 1284 p->cleanup_op(p); 1285 free(p); 1286 } 1287 1288 /* 1289 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw 1290 * data for the packet, check whether the packet passes the filter. 1291 * Returns the return value of the filter program, which will be zero if 1292 * the packet doesn't pass and non-zero if the packet does pass. 1293 */ 1294 int 1295 pcap_offline_filter(struct bpf_program *fp, const struct pcap_pkthdr *h, 1296 const u_char *pkt) 1297 { 1298 struct bpf_insn *fcode = fp->bf_insns; 1299 1300 if (fcode != NULL) 1301 return (bpf_filter(fcode, pkt, h->len, h->caplen)); 1302 else 1303 return (0); 1304 } 1305 1306 /* 1307 * We make the version string static, and return a pointer to it, rather 1308 * than exporting the version string directly. On at least some UNIXes, 1309 * if you import data from a shared library into an program, the data is 1310 * bound into the program binary, so if the string in the version of the 1311 * library with which the program was linked isn't the same as the 1312 * string in the version of the library with which the program is being 1313 * run, various undesirable things may happen (warnings, the string 1314 * being the one from the version of the library with which the program 1315 * was linked, or even weirder things, such as the string being the one 1316 * from the library but being truncated). 1317 */ 1318 #ifdef HAVE_VERSION_H 1319 #include "version.h" 1320 #else 1321 static const char pcap_version_string[] = "libpcap version 1.x.y"; 1322 #endif 1323 1324 #ifdef WIN32 1325 /* 1326 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap 1327 * version numbers when building WinPcap. (It'd be nice to do so for 1328 * the packet.dll version number as well.) 1329 */ 1330 static const char wpcap_version_string[] = "4.0"; 1331 static const char pcap_version_string_fmt[] = 1332 "WinPcap version %s, based on %s"; 1333 static const char pcap_version_string_packet_dll_fmt[] = 1334 "WinPcap version %s (packet.dll version %s), based on %s"; 1335 static char *full_pcap_version_string; 1336 1337 const char * 1338 pcap_lib_version(void) 1339 { 1340 char *packet_version_string; 1341 size_t full_pcap_version_string_len; 1342 1343 if (full_pcap_version_string == NULL) { 1344 /* 1345 * Generate the version string. 1346 */ 1347 packet_version_string = PacketGetVersion(); 1348 if (strcmp(wpcap_version_string, packet_version_string) == 0) { 1349 /* 1350 * WinPcap version string and packet.dll version 1351 * string are the same; just report the WinPcap 1352 * version. 1353 */ 1354 full_pcap_version_string_len = 1355 (sizeof pcap_version_string_fmt - 4) + 1356 strlen(wpcap_version_string) + 1357 strlen(pcap_version_string); 1358 full_pcap_version_string = 1359 malloc(full_pcap_version_string_len); 1360 sprintf(full_pcap_version_string, 1361 pcap_version_string_fmt, wpcap_version_string, 1362 pcap_version_string); 1363 } else { 1364 /* 1365 * WinPcap version string and packet.dll version 1366 * string are different; that shouldn't be the 1367 * case (the two libraries should come from the 1368 * same version of WinPcap), so we report both 1369 * versions. 1370 */ 1371 full_pcap_version_string_len = 1372 (sizeof pcap_version_string_packet_dll_fmt - 6) + 1373 strlen(wpcap_version_string) + 1374 strlen(packet_version_string) + 1375 strlen(pcap_version_string); 1376 full_pcap_version_string = malloc(full_pcap_version_string_len); 1377 1378 sprintf(full_pcap_version_string, 1379 pcap_version_string_packet_dll_fmt, 1380 wpcap_version_string, packet_version_string, 1381 pcap_version_string); 1382 } 1383 } 1384 return (full_pcap_version_string); 1385 } 1386 1387 #elif defined(MSDOS) 1388 1389 static char *full_pcap_version_string; 1390 1391 const char * 1392 pcap_lib_version (void) 1393 { 1394 char *packet_version_string; 1395 size_t full_pcap_version_string_len; 1396 static char dospfx[] = "DOS-"; 1397 1398 if (full_pcap_version_string == NULL) { 1399 /* 1400 * Generate the version string. 1401 */ 1402 full_pcap_version_string_len = 1403 sizeof dospfx + strlen(pcap_version_string); 1404 full_pcap_version_string = 1405 malloc(full_pcap_version_string_len); 1406 strcpy(full_pcap_version_string, dospfx); 1407 strcat(full_pcap_version_string, pcap_version_string); 1408 } 1409 return (full_pcap_version_string); 1410 } 1411 1412 #else /* UN*X */ 1413 1414 const char * 1415 pcap_lib_version(void) 1416 { 1417 return (pcap_version_string); 1418 } 1419 #endif 1420